STYRKE INCH

CD Stud Load/Torque Strengths

Formulas used to calculate the data shown below are as follows:

        A = Mean Effective Thread Area (META) *
        D = Nominal Thread Diameter
        L = Tensile Load Pounds
        N = Threads per Inch
        S = Tensile Stress in PSI
        T = Torque in Inch Pounds

Tensile Load...L = SA
Torque.............T = 0.2 x D x L
META..............A = Pi/4 x {D - (0.9743/N)}²

* META is used instead of root area in calculating screw strengths because of closer correlation with actual tensile strength. META is based on mean diameter, which is the diameter of an imaginary coaxial cylinder whose surface would pass through the thread profile approximately midway between the minor and pitch diameters.

In actual practice a stud should not be used at it's yield load. A factor of safety must be applied. It is generally recommended that studs be used at no more than 60% of yield. However the factor of safety may vary up or down, depending on the application. The user will make this determination.

THREAD	THREAD DIA. (in)	TPI	META	YIELD	ULTIMATE LOAD (lbs)	YIELD TORQUE	ULTIMATE TORQUE
SIZE			(in2)	LOAD (lbs)		(in lbs)	(in lbs)
MILD STEEL
#4	0.1120	40	0.006	211	332	5	7
#6	0.1380	32	0.009	318	500	9	14
#8	0.1640	32	0.014	490	770	16	25
#10	0.1900	24	0.018	614	964	23	37
#10	0.1900	32	0.020	700	1100	27	42
01-apr	0.2500	20	0.032	1114	1750	56	88
maj-16	0.3125	18	0.052	1835	2884	115	180
03-aug	0.3750	16	0.077	2712	4262	203	320
STAINLESS STEEL
#4	0.1120	40	0.006	181	452	4	10
#6	0.1380	32	0.009	273	681	8	19
#8	0.1640	32	0.014	420	1051	14	34
#10	0.1900	24	0.018	526	1315	20	50
#10	0.1900	32	0.020	600	1500	23	57
01-apr	0.2500	20	0.032	955	2387	48	119
maj-16	0.3125	18	0.052	1573	3932	98	246
03-aug	0.3750	16	0.077	2325	5812	174	436
ALUMINUM 1100
#4	0.1120	40	0.006	121	127	3	3
#6	0.1380	32	0.009	182	191	5	5
#8	0.1640	32	0.014	280	294	9	10
#10	0.1900	24	0.018	351	368	13	14
#10	0.1900	32	0.020	400	420	15	16
01-apr	0.2500	20	0.032	636	668	32	33
maj-16	0.3125	18	0.052	1049	1101	66	69
03-aug	0.3750	16	0.077	1550	1627	116	122
ALUMINUM 5356/5154
#4	0.1120	40	0.006	175	241	4	5
#6	0.1380	32	0.009	263	363	7	10
#8	0.1640	32	0.014	406	560	13	18
#10	0.1900	24	0.018	508	701	19	27
#10	0.1900	32	0.020	580	800	22	30
01-apr	0.2500	20	0.032	923	1273	46	64
maj-16	0.3125	18	0.052	1520	2097	95	131
03-aug	0.3750	16	0.077	2247	3100	169	232
* Torque figures based on assumption that excessive deformation of thread has not taken relationship between torque/tension out of its proportional range.
THREAD	THREAD DIA. (in)	TPI	META	YIELD	ULTIMATE LOAD (lbs)	YIELD TORQUE	ULTIMATE TORQUE
SIZE			(in2)	LOAD (lbs)		(in lbs)	(in lbs)
METRIC MILD STEEL
M3	0.1181	50.80	0.008	269	423	6	10
M4	0.1575	36.29	0.013	469	737	15	23
M5	0.1969	31.75	0.022	759	1193	30	47
M6	0.2362	25.40	0.031	1076	1691	51	80
M8	0.3150	20.32	0.056	1960	3080	123	194
M10	0.3937	16.93	0.089	3106	4881	245	384
METRIC STAINLESS STEEL
M3	0.1181	50.80	0.008	231	577	5	14
M4	0.1575	36.29	0.013	402	1005	13	32
M5	0.1969	31.75	0.022	651	1626	26	64
M6	0.2362	25.40	0.031	922	2306	44	109
M8	0.3150	20.32	0.056	1680	4200	106	265
M10	0.3937	16.93	0.089	2662	6656	210	524
METRIC ALUMINUM 1100
M3	0.1181	50.80	0.008	154	161	4	4
M4	0.1575	36.29	0.013	268	281	8	9
M5	0.1969	31.75	0.022	434	455	17	18
M6	0.2362	25.40	0.031	615	646	29	31
M8	0.3150	20.32	0.056	1120	1176	71	74
METRIC ALUMINUM 5356/5154
M3	0.1181	50.80	0.008	223	307	5	7
M4	0.1575	36.29	0.013	389	536	12	17
M5	0.1969	31.75	0.022	629	867	25	34
M6	0.2362	25.40	0.031	892	1230	42	58
M8	0.3150	20.32	0.056	1624	2240	102	141

* Torque figures based on assumption that excessive deformation of thread has not taken relationship between torque/tension out of its proportional range.